King James Version
And stay ye not, but pursue after your enemies, and smite the hindmost of them; suffer them not to enter into their cities: for the LORD your God hath delivered them into your hand.English Standard Version
but do not stay there yourselves. Pursue your enemies; attack their rear guard. Do not let them enter their cities, for the LORD your God has given them into your hand."New International Version
But don't stop! Pursue your enemies, attack them from the rear and don't let them reach their cities, for the LORD your God has given them into your hand."